This one is gonna be a bit harder to save
first thing to do is stop watering, let it go until the leaves and stems droop
Let me tell you why so you can learn to read the plant (why I wanted to see the whole plant) Your plant is overwatered, your roots may be suffering, the signs are the leaves curling under and bottom leaves drooping as well as the top leaves standing up hard (they are trying to transpire the water out and are working hard)
we go down to the center of the plant and the leaves there look like they should relaxed but not drooping or standing up, this tells me the top is getting too much light and the temp is to high, the center is just right the bottom is way off, problem here is the 150 watter can not deliver enough light to the bottom, you need to either up the light or add side lighting
your temps are a little to high, low to mid 70's for flowering with humidity in the low 30's is what you want
hopefully you have a walmart nearby they have temp/humidity meters for as low as $7, they also have ph drops in the fish/aquarium section for $5
YOU NEED EM! The drops work but are a bit off % wise tend to read a tad bit high, your gonna want to check the ph of your tap water before it sets out, after it sets out and after you add ANYTHING to it your target ph with MGMC is gonna be in the 6.7 to 6.9 range (with the drops adjust to 6.5, which will be closer to 6.8 in reality)
the overwatering problem is do to the way you are watering and the moisture control soil (which retains water) You are gonna have to water only when they start to droop to compensate for the moisture control and when you water you want plenty of run off, not a measured amount
So first stop watering
get temp and humidity adjusted
then once you see the leaves AND STEMS droop flush the plant with at least 3 to 4 gallons of water (we're washing out the nutes you added)
then wait till the leaves droop NOT THE STEMS and do it again (flush)
Then take pics post a thread and PM me with a link